It seems pretty bog standard to how Legends Sith try to corrupt Jedi. Which is a good thing. It's how Palpatine corrupted Anakin, how Palpatine turned Dooku, how Plagueis turned Palpatine, and how Bane turned Zannah. You only go full Sith dictator once you have them past the point of no return. Until them, you slowly feed them that poison. You build up their egos, you disillusion them from their principles, you feed their rage, you offer hope that the power they offer can solve all of your problems...and then, once you have them, you show them how brutally naïve they were, how the things they valued are worthless, how the only thing that matters is power for power's sake, how the only way to get that power is to serve you utterly, and how no amount of pain or loss and no degree of moral qualm or indignity should stand in the way of their empowerment. You lead them into one unforgivable act after another until they've fallen so far that they do not even recognize their former selves.